Pump



Sept. 13, 1960 A. P. G. STEFFES PUMP Filed Sept. 9, 1958 INVENTOR70,4744 ADG. S75/:FES

@Trae/Effe Patented Sept. 13, 1960 PUlVLP Adam P. G. Stelfes, 1424Foreman Bldg., 707 S'. Hill St., Los Angeles, Calif.

Filed Sept. 9, '1958, Ser. No. 760,024

11 Claims. (Cl. 103-4152) This invention relates to animprovedA pump.

It is an object of this invention to provide a hermetically sealed pumpsuitable for moving liquids or gases wherein the material being moved isisolated from the operative parts of the pump at all times.

It is a further object of this invention to provide a pump wherechemicals or impurities such as sand and the like, cannot cause anydamage, corrosion or excessive wear to the pump.

It is a further object of this invention to provide a pump where thematerial being moved can be completely isolated from the metal parts ofthe pump so that the material will not be aifected, tainted orcontaminated by the metal of the pump or the lubricants used therewith.

It is still a further object of this invention to provide a pump whereina diaphragm is utilized to shield the lbe installed together in the baseplate of cylinder head 24, .as well as in the side wall, as shown, orseparately in any desired arrangement. The nipple 16 projects throughthe cylinder head liner 27 and has a shoulder 26 formed thereon whichlits into a suitable recess 28 in cylinder head v24# clamping 4the linerl27. A similar seal may bey I 'y provided at inlet 12 to avoid leakage.The inside of the base plate may also be insulated by liner 27 as seenin Figure 1, if itis intended to isolate completely the material beingmoved from these metal parts.

The diaphragm 22 projects upwardly within casing 10 l i and a primarydrive mechanism in the form of a piston 30 engages same and is securelyfastened to the upper side of the closed end of the cylindricaldiaphragm by a suitable adhesive or the like. Piston 30 .in theembodiment of Figure 1 is formed of three parts, an outersleeve intowhich plug 31 screws; la second plug 33 which screws into plug 31 andclamps a portion 35 of diaphragm 22 securing same to the piston. Thepiston 30 is reciprocated in casing 10 by any suitable motivatingsource. A secondary driving mechanism comprises an annular ring 32having a groove 34 on the under or diaphragm moving parts and provide along pumping stroke, without y leakage, even if operated at the-slowestspeed.

It is still a further object of this invention `to provide a pumpwherein a hermetically sealed diaphragm is utilized to prevent any lossor leakage whatsoever of the material being moved, even under thehighest pressures.

It is still a further object of this invention to provide means forequally distributing the pressure on every part of the diaphragm duringpumping.

It lis a further object of this invention to provide a per-v fectlysealed piston for use in hydraulic or pneumatic controls, presses,lifts, jacks, etc.

It is still a further object of this invention to provide a means ofmeasuring accurately hydraulic and pneumatic pressures directed into thecylinder and against the piston and the grooved side of the annular ringsurrounding it.V

It -is a further object of this invention to provide a sealed aircushion shock absorber under constant pressure supporting the piston andweight resting upon it.

It is `a further object of this invention to provide a pump whichoperates with a minimum of friction and requires a minimum oflubrication for its moving parts.

Other objects and advantages will be readily apparent from the followingdescription:

In the drawings:

Figure 1 is van elevation in section of a pump embodying this invention.

Figure 2 is a section ltaken Figure 3 is a mechanism. cage.

Figure 4 is a section taken along line 4 4 of Figure 2.

A cylindrical casing 10 is provided.

A flexible diaphragm 22 is secured within casing 10, the extremity ofsaid diaphragm being clamped between the casing 10 andcylinder head 24to which said casing is secured by flanges 25. Said cylinder head, in apump, may have an inlet 12 and an outlet 14. The outlet is formed by -athreaded nipple 16 which screws into a suitable opening in head 24 andprojects therefrom forming a valve seat. A spring loaded valve 18mounted in tubing 20 seats against said valve seat and permits flowoutwardly through the outlet only. The inlet and outlet may along line2-2 of Figure l. perspective of they secondary driving engaging sidethereof. The distance between the cylinder wall and piston should beapproximately three times the thickness of the diaphragm material. Acage 36 is positioned in the -annulus between piston 30 and casing 10'above ring 32 and ring 32 is bolted thereon with sealing ring 38 clampedbetween ring 32 and the annular base of cage 36. The vertical arms ofthe cage will be long enough so that when the piston is completelyretracted, the upper rim of the sealing ring will not come in contactwith the lowervends of the cylinder racks. In this embodiment four arms40 project upwardly from the base of cage 36, each of which is forked atits free extremity and has a pinio-n 42 rotatably mountedbetween saidforks.

A pair of racks of equal length are provided for each pinion, one 44 issecured to piston 30 and the other 46 to the inner face of casing 10. Abonnet 4S screws onto casing 10 to secure the parts in the desiredassembly.

When piston 30 is lowered in casing 10 the pinions 42 are driven byengagement between racks 44 and y46. By means of the racks and pinions,the cage 36 and ring 3-2 are descending at exactly one-half the rate ofdescent of piston 30 thereby accommodating distortion of diaphragm 22upon descent of piston 30 and keeping a continuous pressure upon everypart of the diaphragm and the fluid within the casing between the inletand outlet overcomingv one way valve 18 and pumping uid to the outlet.Upon ascent of the piston further fluid is drawn into the casing throughthe inlet.

Although ring 32 in this embodiment descends at exactly one-half therate of piston 30 this ratio may be varied, if necessary, by a doublepinion of unequal diameters to accommodate any possible excessdiaphragm, created by descent of piston 30, which projects into theannulus between the piston and casing 10. This ratio should be such thatthe same pressure is exerted upon all parts of the diaphragm whennecessary to prevent undue stretching or bunching of the diaphragmduring descent of the piston. The rate of descent of ring 32 can be madeto vary, if necessary, with the material used for the diaphragm, lengthof stroke of the piston and the size of the annulus, the latter beingdetermined primarily by the thickness of the diaphragm material.

While what hereinbefore has been described as the preferred embodimentof this invention, it is readily apparent that alterations andmodications may be resorted to without departing from the scope of thisinvention and such alterations and modifications are intended to beincluded within the scope of the appended claims.

I claim:

1. A pump comprising: a cylindrical casing, a flexible 3 diaphragmmounted within said casing, a piston concentric with and mounted withinsaid casing engaging said diaphragm, a ring surrounding said pistonfilling the space between said piston and said casing and engaging saiddiaphragm, means contacting and moving said'piston and means contactingand moving said ring at a reduced rate of speed with respect to saidpiston to accommodate folding of said diaphragm upon movement of saidpiston, said casing having an inlet and an outlet on the opposite sideof said diaphragm from said piston.

2. A pump comprising: a cylindrical casing, a flexible diaphragm mountedwithin said casing, a piston concentric with and mounted within saidcasing engaging said diaphragm, a ring surrounding said piston fillingthe space between said piston and said casing and engaging saiddiaphragm, a rack on said piston, a second rack on said casing and apinion mounted upon said ring and meshing with said racks wherebymovement of said piston moves said ring, said casing having an inlet andan outlet on the opposite side of said diaphragm from said piston.

3. A pump comprising: a cylindrical casing, a flexible diaphragm mountedwithin said casing, a piston concentric with and mounted within saidcasing engaging said diaphragm, a ring surrounding said piston fillingthe space between said piston and said casing and engaging saiddiaphragm, means contacting and moving said piston and means contactingand moving said ring at a reduced rate of speed with respect to saidpiston to accommodate folding of said diaphragm upon movement of saidpiston, said ring having a thickness of approximately three times thethickness of the diaphragm, said casing having an inlet and an outlet onthe opposite side of said diaphragm from said piston.

4. A pump comprising: a cylindrical casing, a ilexible diaphragm mountedwithin said casing, a piston concentric with and mounted within saidcasing engaging said diaphragm, a ring surrounding said piston fillingthe space between said piston and said casing and engaging saiddiaphragm, means contacting and moving said piston, means contacting andmoving said ring at a reduced rate of speed with respect to said pistonto accommodate folding of said diaphragm upon movement of said piston,said ring having a thickness of approximately three times the thicknessof the diaphragm and means securing said primary drive means to saiddiaphragm, said casing having an inlet and an outlet on the oppositeside of said diaphragm from said piston.

5. A pump comprising: a cylindrical casing, a exible diaphragm mountedwithin said casing, a piston concentric with and mounted within saidcasing engaging said diaphragm, a ring surrounding said piston fillingthe space between said piston and said casing and engaging saiddiaphragm, a rack on said piston, a second rack on said casing and apinion mounted upon said ring and meshing with said racks wherebymovement of said piston moves said ring, said racks being of the samelength, said casing having an inlet and an outlet on the opposite sideof said diaphragm from said piston.

6. A pump comprising: a cylindrical casing, a flexible diaphragm mountedwithin said casing, a piston concentric with and mounted within saidcasing engaging said diaphragm, a ring surrounding said piston fillingthe space between said piston and said casing and engaging saiddiaphragm, a rack on said piston, a second rack on said casing and apinion mounted upon said ring and meshing with said racks wherebymovement of said piston moves said ring, said ring maintaining theconcentric relationship of said piston and casing, said casing having aninlet adjacent said ring,

7. A pump comprising: a cylindrical casing, a exible diaphragm mountedwithin said casing, a piston concentric with and mounted within saidhousing engaging said diaphragm, a ring surrounding said piston fillingthe space between said piston and said casing and engaging saiddiaphragm, a rack on said piston, a second rack on said casing, an armmounted upon said ring and a pinion carried by said arm and meshing withsaid racks, said arm having a length equal to or greater than said rackspreventing said ring from contacting said racks, said casing having aninlet and an outlet on the opposite side of said diaphragm from saidpiston.

8. A pump comprising: a cylindrical casing, a exihle diaphragm mountedwithin said casing, a piston concentric with and mounted within saidcasing engaging said diaphragm, a ring surrounding said piston fillingthe space between said piston and said casing and engaging saiddiaphragm, a rack on said piston, a second rack on said casing, an armmounted upon said ring, a pinion carried by said arm and meshing withsaid racks, said arm having a length equal to or greater than said rackspreventing said ring from contacting said racks and a sealing ring saidcasing having an inlet and an outlet on the opposite side of saiddiaphragm from said piston.

9. A pump comprising: a cylindrical casing, a exible diaphragm mountedwithin said casing, a piston concentric with and mounted within saidcasing engaging said diaphragm, a ring surrounding said piston fillingthe space between said piston and said casing and engaging saiddiaphragm, means contacting and moving said piston and means contactingand moving said ring at a reduced rate of speed with respect to saidpiston to accommodate and an outlet on the opposite side of saiddiaphragm from said piston.

folding of said diaphragm upon movement of said piston, said ring havinga groove on the diaphragm contacting face thereof, said casing having aninlet and an outlet on the opposite side of said diaphragm from saidpiston.

10. A pump comprising: a cylindrical casing, a flexible diaphragmmounted within said casing, a primary drive engaging said diaphragm, asecondary drive surrounding said primary drive engaging said diaphragmand moving at a reduced rate of speed with respect to said primary driveto accommodate folding of said diaphragm upon movement of said primarydrive means and means securing said primary drive means to saiddiaphragm, said secondary drive having a groove on the diaphragmcontacting face thereof, said casing having an inlet and an outlet onthe opposite side of said diaphragm from said drive mechanisms.

11. A pump comprising: a cylindrical casing, a ilexible diaphragmmounted within said casing, a piston concentric with and mounted withinsaid casing engaging said diaphragm, a ring surrounding said pistonfilling the space between said piston and said casing and engaging saiddiaphragm, means contacting and moving said piston and means contactingand moving said ring at a reduced rate of speed with respect to saidpiston to accommodate folding of said diaphragm upon movement of saidpiston, said ring having a thickness of approximately three times thethickness of the diaphragm, said ring having a groove on the diaphragmcontacting face thereof, said casing having an inlet and an outlet onthe opposite side of said diaphragm from said piston.

References Cited in the file of this patent UNITED STATES PATENTS1,445,844 Mueser Feb. 20, 1923 FOREIGN PATENTS 348,013 Great BritainApr. 27, 1931

